Algorithm to changing bistatic imaging geometric model for TH-2 satellite

doi:10.11947/j.AGCS.2022.20210328

Abstract

Abstract: Imaging geometric model of master and slave satellite directly affects many steps in InSAR data processsing, such as complex image rough registration, flat plain effect removing, InSAR location, baseline calibration, block adjustment and ortho-rectification. In order to keep unified algorithm in imageing, both master and slave satellite of TH-2 use bistatic imaging geometric model. For complex image rough registration, flat plain effect removing and InSAR location step, bistatic imaging geometric model just increase algorithm complexity, but for baseline calibration, it brings new chanlleges. On one hand, most current baseline calibration algorithms are based on monostatic imaging geometric model and can not be used in TH-2; on the other hand, pair position combines to form four baselines, and four baselines exist correlation in calibration, which leads to difficulty for baseline calibration. In order to keep accuracy of baseline calibration, the paper presents algorithm to chang bistatic geometric model into monostatic model and anlyses the transformation accuracy for slave satellite. It's proved that the algorithm has high accuracy and the brought error can be ignored by theoretical analysis and test.

Key words: InSAR, distributed satellite, equivalent phase center, imaging geometric model, baseline calibration

CLC Number:

P227

CHEN Gang, QIAN Fangming, LIU Zhiming, LOU Liangsheng. Algorithm to changing bistatic imaging geometric model for TH-2 satellite[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(12): 2417-2424.

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